如何从xcode中提供html文件值

时间:2012-07-21 06:21:33

标签: iphone xcode combobox

我有iphone应用程序我已经创建了一个组合框我希望组合框应该从xcode直接获取值而不是来自html文件所以如何做到这一点我使用以下代码来获取html文件中的组合框

NSString *htmlPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"combo.html"];
NSString *htmlContent = [NSString stringWithContentsOfFile:htmlPath];
[webView loadHTMLString:htmlContent baseURL:nil]; 

combo.html:

 <html>   
 <SELECT NAME="food" SIZE="10" style="width: 200px;" style="height: 100px "> 
 <OPTION VALUE="0">OK</OPTION>
 <OPTION VALUE="1">Good</OPTION>
 <OPTION VALUE="2">Best</OPTION>
 <OPTION VALUE="3">Average</OPTION>
 </SELECT> 
 </html>

1 个答案:

答案 0 :(得分:0)

我不是百分百肯定我理解这个问题,但我认为您是在询问是否可以从应用包中加载HTML文件,然后从您的应用中动态插入一些不同的HTML内容...... ?

如果是这样,你当然可以这样做。

首先,我们将内容加载到可变字符串中:

NSString *htmlPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"combo.html"];
NSError *error;
NSMutableString *htmlContent = [NSMutableString stringWithContentsOfFile: htmlPath 
                                                                encoding: NSUTF8StringEncoding 
                                                                   error: &error];

要在组合框中插入新选项/值,请使用以下内容:

// look for the start of the combo box called "food"
NSRange range = [htmlContent rangeOfString: @"select name=\"food\"" 
                                   options: NSCaseInsensitiveSearch];
if (range.location != NSNotFound) {
    // search for the end tag </select>
    range.length = htmlContent.length - range.location;
    NSRange end = [htmlContent rangeOfString: @"</select>" 
                                     options: NSCaseInsensitiveSearch 
                                       range: range];
    if (end.location != NSNotFound) {
        NSString *newChoice = @"Awesome!";  // get this dynamically however you want
        NSString *newOption = 
           [NSString stringWithFormat: @"<option value=\"4\">%@</option>\n", newChoice];
        [htmlContent insertString: newOption atIndex: end.location];
        NSLog(@"htmlContent = %@", htmlContent);
    }
}

如果您想在一个现有的组合框选项中更改显示的,请使用以下代码:

NSString *optionTwoHtml = @"<option value=\"2\">";
NSRange optionTwo = [htmlContent rangeOfString: optionTwoHtml 
                                       options: NSCaseInsensitiveSearch];
if (optionTwo.location != NSNotFound) {
    int start = optionTwo.location + optionTwoHtml.length;
    // search for the end tag </option>
    optionTwo.length = htmlContent.length - optionTwo.location;
    NSRange end = [htmlContent rangeOfString: @"</option>" 
                                     options: NSCaseInsensitiveSearch 
                                       range: optionTwo];
    if (end.location != NSNotFound) {
        NSString *newValue = @"Better Than Best!";
        NSRange oldRange = NSMakeRange(start, end.location - start);
        [htmlContent replaceCharactersInRange: oldRange 
                                   withString: newValue];
        NSLog(@"htmlContent = %@", htmlContent);
    }
}

注意此代码只显示您可以执行的操作。它没有针对性能进行优化。您展示的HTML内容非常小,因此解析代码的效率无关紧要。如果您使用更大的HTML文件,则可能需要稍微优化一下。